I’m familiar with the Alvarez’ theory. Good as any. Question is, did something similar happen in more recent times, around 13,000 years ago give or take? If for example an impactor had hit the ~2 mile thick ice sheet around the Great Lakes, what would have happened? I’ve never seen where anybody suggests it but, could such an impact have created some of the Great Lakes as the impactor vaporized a huge portion of the ice? What a sight that would have been!
It is kind of interesting though if you put the timeline together and see what sort of historical earth changes are depicted archaeologically, Biblically, mythologically, etc. every 3,600 or so years. The evidence that there were plants and animals on the continent of Antarctica points to some type of pole shift or tectonic shift. Then they go and find massive ancient buildings under the ocean near Japan... cities that I don't think they've ever found any record of historically or in the oral history. It just makes you wonder. I think it's totally possible that the Biblical flood could have been a tsunami or result of an asteroid or massive hurricane resulting from a climate shift.